Kalamax, the Stormsire

Bracket

• B1 Exhibition — Not in the same deck as its two-card combo partners: Reverberate, Expansion // Explosion, Increasing Vengeance, Twincast, Return the Favor, Reiterate, Fury Storm, Flare of Duplication, Insidious Will, Fork, Wild Ricochet, Refuse // Cooperate
• B2 Core — Not in the same deck as its two-card combo partners: Reverberate, Expansion // Explosion, Increasing Vengeance, Twincast, Return the Favor, Reiterate, Fury Storm, Flare of Duplication, Insidious Will, Fork, Wild Ricochet, Refuse // Cooperate
• B3 Upgraded — allowed: Its two-card combos are not early, which Bracket 3 allows
• B4 Optimized — allowed: No restriction beyond the banned list
• B5 cEDH — allowed: No restriction beyond the banned list

Why

• Two-card combo with Reverberate, Expansion // Explosion, Increasing Vengeance, Twincast, Return the Favor, Reiterate, Fury Storm, Flare of Duplication, Insidious Will, Fork, Wild Ricochet, Refuse // Cooperate (none of them early)

How Lotus Vault estimates a bracket

Bracket: Lotus Vault analysis, with Commander Spellbook flags

Combos

27 known combos, 12 of them two-card.

• Kalamax, the Stormsire + Reverberate
  Produces: Infinite +1/+1 counters on a creature, Infinite magecraft triggers
  View on Commander Spellbook
• Kalamax, the Stormsire + Expansion // Explosion
  Produces: Infinite +1/+1 counters on a creature, Infinite magecraft triggers
  View on Commander Spellbook
• Kalamax, the Stormsire + Increasing Vengeance
  Produces: Infinite +1/+1 counters on a creature, Infinite magecraft triggers
  View on Commander Spellbook

Combos: Commander Spellbook

Rulings

• 2020-04-17 · Wizards of the Coast
  You can't choose to pay any additional costs for the copy created by Kalamax's first ability. However, effects based on any additional costs that were paid for the original spell are copied as though those same costs were paid for the copy too.
• 2020-04-17 · Wizards of the Coast
  If the spell that's copied has damage divided as it was cast, the division can't be changed, although the targets receiving that damage still can. The same is true of spells that distribute counters.
• 2020-04-17 · Wizards of the Coast
  Kalamax's first ability considers the entire turn. If you cast an instant spell before Kalamax becomes tapped, its first ability won't trigger when you cast your second.
• 2020-04-17 · Wizards of the Coast
  If an effect copies an instant spell multiple times, Kalamax's last ability triggers that many times.
• 2020-04-17 · Wizards of the Coast
  A copy is created even if the spell that caused Kalamax's ability to trigger has been countered by the time that ability resolves. The copy resolves before the original spell.
• 2020-04-17 · Wizards of the Coast
  An ability that triggers when a player copies a spell resolves before the copy. It resolves even if that spell is countered.
• 2020-04-17 · Wizards of the Coast
  If Kalamax becomes tapped as a cost to cast your first instant spell in a turn, its first ability triggers.
• 2020-04-17 · Wizards of the Coast
  If an effect copies a card rather than a spell (such as that of God-Eternal Kefnet), this doesn't cause Kalamax's last ability to trigger.
• 2020-04-17 · Wizards of the Coast
  The copies that Kalamax's first ability creates are created on the stack, so they're not "cast." Abilities that trigger when a player casts a spell won't trigger.
• 2020-04-17 · Wizards of the Coast
  If the spell that's copied is modal (that is, it says "Choose one —" or the like), the copy created by Kalamax's first ability will have the same mode or modes. You can't choose different ones.

Rulings: Scryfall · Wizards of the Coast